{"id":2904,"date":"2024-07-10T07:00:33","date_gmt":"2024-07-10T07:00:33","guid":{"rendered":"https:\/\/nfc-readers.com\/?p=2904"},"modified":"2024-07-10T07:02:35","modified_gmt":"2024-07-10T07:02:35","slug":"can-uhf-rfid-do-high-precision-positioning","status":"publish","type":"post","link":"https:\/\/nfc-readers.com\/cs\/can-uhf-rfid-do-high-precision-positioning\/","title":{"rendered":"M\u016f\u017ee UHF RFID prov\u00e1d\u011bt vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed?"},"content":{"rendered":"<div><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"P\u0159epnout obsah\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">P\u0159epnout<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nfc-readers.com\/cs\/can-uhf-rfid-do-high-precision-positioning\/#Can_UHF_RFID_be_used_for_high-precision_positioning\" title=\"Lze UHF RFID pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed?\">Lze UHF RFID pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nfc-readers.com\/cs\/can-uhf-rfid-do-high-precision-positioning\/#_What_scenarios_are_suitable_for_UHF_RFID_high-precision_positioning\" title=\"\u00a0Jak\u00e9 sc\u00e9n\u00e1\u0159e jsou vhodn\u00e9 pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed UHF RFID\">\u00a0Jak\u00e9 sc\u00e9n\u00e1\u0159e jsou vhodn\u00e9 pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed UHF RFID<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Can_UHF_RFID_be_used_for_high-precision_positioning\"><\/span>Lze UHF RFID pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div><\/div>\n<div>Dovolte mi, abych v\u00e1m nejprve odpov\u011bd\u011bl. UHF RFID lze pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed, ale p\u0159esnost je asi 1 metr.<\/div>\n<div><\/div>\n<div>UHF RFID se pou\u017e\u00edv\u00e1 jako polohovac\u00ed \u0159e\u0161en\u00ed. Z\u00e1kladn\u00edm za\u0159\u00edzen\u00edm je \u010dte\u010dka vyu\u017e\u00edvaj\u00edc\u00ed sf\u00e1zovanou ant\u00e9nu. Princip sf\u00e1zovan\u00e9 ant\u00e9ny je podrobn\u011b pops\u00e1n v knize Gan Quan \u201eUHF RFID Technology Products and Applications for the Internet of Things\u201c. P\u0159\u00edslu\u0161n\u00fd obsah budeme citovat.<\/div>\n<div><\/div>\n<div><\/div>\n<div>Princip f\u00e1zovan\u00e9 ant\u00e9ny<\/div>\n<div><\/div>\n<div><\/div>\n<div>Ant\u00e9na s f\u00e1zov\u00fdm polem, tak\u00e9 zn\u00e1m\u00e1 jako sf\u00e1zovan\u00e1 ant\u00e9na, ozna\u010duje ant\u00e9nu, kter\u00e1 m\u011bn\u00ed tvar sm\u011brov\u00e9ho vzoru \u0159\u00edzen\u00edm nap\u00e1jec\u00ed f\u00e1ze vyza\u0159ovac\u00ed jednotky v poli ant\u00e9ny. \u0158\u00edzen\u00edm f\u00e1ze lze zm\u011bnit sm\u011br maxim\u00e1ln\u00ed hodnoty sm\u011brov\u00e9ho obrazce ant\u00e9ny pro dosa\u017een\u00ed \u00fa\u010delu skenov\u00e1n\u00ed paprsku. Lze jednodu\u0161e pochopit, \u017ee tradi\u010dn\u00ed ant\u00e9na m\u00e1 pouze jeden pevn\u00fd vyza\u0159ovac\u00ed diagram, zat\u00edmco maticov\u00e1 ant\u00e9na m\u016f\u017ee m\u00edt v\u00edce vyza\u0159ovac\u00edch diagram\u016f v r\u016fzn\u00fdch sm\u011brech. Kdy\u017e se sf\u00e1zovan\u00e1 ant\u00e9na pou\u017e\u00edv\u00e1 v ultravysok\u00e9 frekvenci <a href=\"https:\/\/nfc-readers.com\/cs\/Wholesale\/rfid-nfc-reader\/\">RFID syst\u00e9m<\/a>lze jednu ant\u00e9nu p\u0159em\u011bnit na v\u00edce ant\u00e9n v r\u016fzn\u00fdch sm\u011brech. N\u00e1sleduj\u00edc\u00ed obr\u00e1zek ukazuje vyza\u0159ovac\u00ed diagram br\u00e1ny s f\u00e1zovanou ant\u00e9nou. P\u016fvodn\u00ed osa vyza\u0159ov\u00e1n\u00ed hlavn\u00edho laloku ant\u00e9ny \u03b8=0\u00b0. Po \u00faprav\u011b f\u00e1ze specifikovan\u00e9 radia\u010dn\u00ed jednotky v poli ant\u00e9ny se osa hlavn\u00edho laloku z\u00e1\u0159en\u00ed vych\u00fdl\u00ed a maxim\u00e1ln\u00ed odchylka m\u016f\u017ee b\u00fdt 45\u00b0. Ve srovn\u00e1n\u00ed s tradi\u010dn\u00edm \u0159e\u0161en\u00edm se v\u00fdrazn\u011b zv\u00fd\u0161ilo pokryt\u00ed br\u00e1ny s f\u00e1zovan\u00fdm polem pomoc\u00ed \u0159e\u0161en\u00ed zn\u00e1zorn\u011bn\u00e9ho na obr\u00e1zku n\u00ed\u017ee. P\u016fvodn\u00ed vyza\u0159ovac\u00ed \u00fahel 3dB byl 30\u00b0 a nyn\u00ed se stal 120\u00b0.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<figure id=\"attachment_2905\" aria-describedby=\"caption-attachment-2905\" style=\"width: 451px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2905\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-300x208.png\" alt=\"rfid pozice\" width=\"451\" height=\"313\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-300x208.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position-18x12.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/rfid-position.png 355w\" sizes=\"auto, (max-width: 451px) 100vw, 451px\" \/><figcaption id=\"caption-attachment-2905\" class=\"wp-caption-text\">rfid pozice<\/figcaption><\/figure>\n<\/div>\n<div>Vyza\u0159ovac\u00ed diagram sf\u00e1zovan\u00e9 ant\u00e9nn\u00ed br\u00e1ny<\/div>\n<div><\/div>\n<div>Specifick\u00fd provoz br\u00e1ny s f\u00e1zov\u00fdm polem lze ch\u00e1pat tak, \u017ee z jednoportov\u00e9 \u010dte\u010dky se stane v\u00edceportov\u00e1 \u010dte\u010dka (kolik kombinac\u00ed f\u00e1z\u00ed odpov\u00edd\u00e1 kolika port\u016fm). P\u016fvodn\u00ed jednoportov\u00e1 \u010dte\u010dka se m\u016f\u017ee p\u0159ipojit pouze k jedn\u00e9 ant\u00e9n\u011b a dosah z\u00e1\u0159en\u00ed je pevn\u00fd, zat\u00edmco v\u00edceportov\u00e1 \u010dte\u010dka se m\u016f\u017ee p\u0159ipojit k mnoha ant\u00e9n\u00e1m a ka\u017ed\u00e1 ant\u00e9na m\u00e1 jin\u00fd dosah vyza\u0159ov\u00e1n\u00ed. Tato multiportov\u00e1 \u010dte\u010dka dok\u00e1\u017ee vybrat oblast, kter\u00e1 m\u00e1 b\u00fdt skenov\u00e1na podle pot\u0159eb, a spustit odpov\u00eddaj\u00edc\u00ed port pro p\u0159enos sign\u00e1lu p\u0159es odpov\u00eddaj\u00edc\u00ed ant\u00e9nu pro pokryt\u00ed specifikovan\u00e9 oblasti.<\/div>\n<div><\/div>\n<div><\/div>\n<div>Funkce ur\u010dov\u00e1n\u00ed polohy ant\u00e9ny s f\u00e1zov\u00fdm polem<\/div>\n<div><\/div>\n<div>Ohledn\u011b polohovac\u00ed funkce UHF<a href=\"https:\/\/nfc-readers.com\/cs\/Wholesale\/rfid-nfc-reader\/\"> RFID \u010dte\u010dky<\/a>vezm\u011bte dv\u011b b\u011b\u017en\u00e9 br\u00e1ny s f\u00e1zovan\u00fdm polem na trhu: xSpan a xArray spole\u010dnosti Impinj jako p\u0159\u00edklady.<\/div>\n<div><\/div>\n<div>xArray je br\u00e1na se \u010dtvercov\u00fdm f\u00e1zov\u00fdm polem. Kdy\u017e je xArray zav\u011b\u0161eno na st\u0159e\u0161e, jeho oblast pokryt\u00ed je kruh s celkem 8 sektory a 52 oblastmi z\u00e1\u0159en\u00ed. Zjednodu\u0161en\u011b ji lze ch\u00e1pat jako 52portovou \u010dte\u010dku p\u0159ipojenou k 52 ant\u00e9n\u00e1m s r\u016fzn\u00fdmi oblastmi vyza\u0159ov\u00e1n\u00ed.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2906\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-300x148.png\" alt=\"\" width=\"513\" height=\"253\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-300x148.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-18x9.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-600x295.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID.png 728w\" sizes=\"auto, (max-width: 513px) 100vw, 513px\" \/><\/div>\n<p>&nbsp;<\/p>\n<div>Vzor paprsku xArray<\/div>\n<div><\/div>\n<div>xSpan je pravo\u00fahl\u00e1 br\u00e1na s f\u00e1zov\u00fdm polem. Br\u00e1nu xSpan lze pova\u017eovat za zjednodu\u0161enou verzi xArray. Kdy\u017e je xSpan zav\u011b\u0161en na st\u0159e\u0161e, plocha, kterou pokr\u00fdv\u00e1, je obd\u00e9ln\u00edk s celkem 13 radia\u010dn\u00edmi oblastmi. Zjednodu\u0161en\u011b ji lze ch\u00e1pat jako 13portovou \u010dte\u010dku p\u0159ipojenou k ant\u00e9n\u00e1m ve 13 r\u016fzn\u00fdch oblastech vyza\u0159ov\u00e1n\u00ed.<\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2907\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-300x149.png\" alt=\"\" width=\"503\" height=\"250\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-300x149.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-18x9.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-600x298.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position.png 699w\" sizes=\"auto, (max-width: 503px) 100vw, 503px\" \/><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div>xSpan paprsek vzor<\/div>\n<div><\/div>\n<div>Ve skute\u010dn\u00e9m prost\u0159ed\u00ed se oblasti z\u00e1\u0159en\u00ed sousedn\u00edch \u010d\u00edsel vz\u00e1jemn\u011b p\u0159ekr\u00fdvaj\u00ed. Kdy\u017e je stejn\u00fd tag identifikov\u00e1n ve v\u00edce o\u010d\u00edslovan\u00fdch radia\u010dn\u00edch oblastech, lze konkr\u00e9tn\u00ed um\u00edst\u011bn\u00ed tagu vypo\u010d\u00edtat podle velikosti RSSI. Procesem v\u00fdpo\u010dtu je p\u0159ev\u00e9st rozd\u00edl RSSI na rozd\u00edl vzd\u00e1lenosti a pot\u00e9 jej implementovat pomoc\u00ed v\u00edcebodov\u00e9ho polohovac\u00edho algoritmu. Samoz\u0159ejm\u011b, tag pravd\u011bpodobn\u011b spadne do oblasti z\u00e1\u0159en\u00ed s nejv\u011bt\u0161\u00ed hodnotou RSSI.<\/div>\n<div><\/div>\n<div>Nejv\u011bt\u0161\u00ed funkc\u00ed f\u00e1zov\u00e9 br\u00e1ny je polohov\u00e1n\u00ed, posuzov\u00e1n\u00ed polohy a pohybu objektu. N\u00e1sleduj\u00edc\u00ed obr\u00e1zek ukazuje pohyb tagu, kter\u00fd lze sledovat pomoc\u00ed xSpan a xArray. Mezi nimi m\u016f\u017ee xSpan sledovat pohyb tag\u016f pouze v jednom sm\u011bru osy, zat\u00edmco xArray m\u016f\u017ee sledovat tagy pohybuj\u00edc\u00ed se v n\u011bkolika r\u016fzn\u00fdch sm\u011brech.<\/div>\n<div><\/div>\n<\/div>\n<div><\/div>\n<div><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2908\" src=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-300x140.png\" alt=\"\" width=\"493\" height=\"230\" srcset=\"https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-300x140.png 300w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-18x8.png 18w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56-600x280.png 600w, https:\/\/nfc-readers.com\/wp-content\/uploads\/2024\/07\/UHF-RFID-position-13.56.png 726w\" sizes=\"auto, (max-width: 493px) 100vw, 493px\" \/><\/div>\n<div><\/div>\n<div>\n<div>Sledov\u00e1n\u00ed sm\u011bru br\u00e1ny s f\u00e1zov\u00fdm polem<\/div>\n<div><\/div>\n<div><\/div>\n<div>Aby bylo zaji\u0161t\u011bno sledov\u00e1n\u00ed objekt\u016f v re\u00e1ln\u00e9m \u010dase, je nutn\u00e9 zajistit dostate\u010dn\u011b vysokou rychlost p\u0159ep\u00edn\u00e1n\u00ed ant\u00e9ny. I kdy\u017e je p\u0159epnut\u00ed poka\u017ed\u00e9 50 ms, skenov\u00e1n\u00ed v\u0161ech radia\u010dn\u00edch oblast\u00ed xArray trv\u00e1 2,5 s. Proto by p\u0159i aplikaci sledov\u00e1n\u00ed objekt\u016f m\u011bl b\u00fdt zaru\u010den po\u010det zna\u010dek v poli. Pokud je vy\u017eadov\u00e1no vysoce p\u0159esn\u00e9 sledov\u00e1n\u00ed, nem\u011bl by po\u010det zna\u010dek p\u0159ekro\u010dit 20; m\u00e1-li b\u00fdt dosa\u017eeno vysokorychlostn\u00edho sledov\u00e1n\u00ed, nem\u011bl by po\u010det zna\u010dek p\u0159ekro\u010dit 50.<\/div>\n<div><\/div>\n<div>Ve skute\u010dn\u00fdch testech se z r\u016fzn\u00fdch d\u016fvod\u016f vyskytuj\u00ed ur\u010dit\u00e9 chyby. Nam\u011b\u0159en\u00e1 data v ide\u00e1ln\u00edm prost\u0159ed\u00ed bez okluze a odrazu jsou: do 1,5 metru je chyba pravd\u011bpodobnosti 85%. Chyba bude v\u011bt\u0161\u00ed ve slo\u017eit\u00fdch prost\u0159ed\u00edch, zejm\u00e9na v maloobchodn\u00edch prodejn\u00e1ch s odrazy na polic\u00edch a st\u011bn\u00e1ch, stejn\u011b jako p\u0159i stohov\u00e1n\u00ed a v\u00fd\u0161ce um\u00edst\u011bn\u00ed \u0161t\u00edtk\u016f, co\u017e bude m\u00edt velk\u00fd vliv na p\u0159esnost testu. Ve srovn\u00e1n\u00ed s tradi\u010dn\u00edmi technologiemi v\u0161ak pou\u017eit\u00ed f\u00e1zovan\u00fdch bran v\u00fdrazn\u011b zlep\u0161uje p\u0159esnost a pohodl\u00ed p\u0159i ur\u010dov\u00e1n\u00ed polohy a vyhled\u00e1v\u00e1n\u00ed objekt\u016f.<\/div>\n<div><\/div>\n<div>\n<div>Optimalizace p\u0159esnosti polohov\u00e1n\u00ed v\u00fdzkumn\u00fdm t\u00fdmem Shanghai Jiaotong University se odr\u00e1\u017e\u00ed p\u0159edev\u0161\u00edm na \u00farovni algoritmu. Ve sv\u00e9m \u0159e\u0161en\u00ed pot\u0159ebuj\u00ed nejprve p\u0159e\u010d\u00edst informace o f\u00e1zi sign\u00e1lu odrazu tagu prost\u0159ednictv\u00edm ant\u00e9ny \u010dtec\u00edho pole v\u00fdrobc\u016f, jako je Impinj, a pot\u00e9 optimalizovat polohovac\u00ed algoritmus na z\u00e1klad\u011b informac\u00ed o f\u00e1zi.<\/div>\n<div><\/div>\n<div>P\u0159esnost polohov\u00e1n\u00ed na \u00farovni centimetr\u016f uv\u00e1d\u011bn\u00e1 ve zpr\u00e1v\u00e1ch v\u00fd\u0161e je efekt dosa\u017een\u00fd za relativn\u011b ide\u00e1ln\u00edch podm\u00ednek. K dosa\u017een\u00ed takov\u00e9 p\u0159esnosti je zapot\u0159eb\u00ed mnoho specifick\u00fdch podm\u00ednek. Pokud je to v obecn\u00e9m prost\u0159ed\u00ed, na z\u00e1klad\u011b optimalizace algoritmu, je to velk\u00fd pr\u016flom pro zlep\u0161en\u00ed p\u0159esnosti polohov\u00e1n\u00ed UHF RFID \u0159e\u0161en\u00ed pro ur\u010dov\u00e1n\u00ed polohy z p\u0159ibli\u017en\u011b 1 metru na \u00farove\u0148 decimetr\u016f.<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<h2><span class=\"ez-toc-section\" id=\"_What_scenarios_are_suitable_for_UHF_RFID_high-precision_positioning\"><\/span>\u00a0Jak\u00e9 sc\u00e9n\u00e1\u0159e jsou vhodn\u00e9 pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed UHF RFID<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div><\/div>\n<div>P\u0159esnost ur\u010dov\u00e1n\u00ed polohy UHF RFID je asi 1 m, co\u017e tak\u00e9 pat\u0159\u00ed do kategorie vysoce p\u0159esn\u00e9 polohovac\u00ed technologie. V sou\u010dasnosti je bezdr\u00e1tovou technologi\u00ed ur\u010dov\u00e1n\u00ed polohy s nejlep\u0161\u00ed p\u0159esnost\u00ed ur\u010dov\u00e1n\u00ed polohy na trhu UWB, kter\u00e1 m\u016f\u017ee v ide\u00e1ln\u00edm prost\u0159ed\u00ed dosahovat p\u0159esnosti ur\u010dov\u00e1n\u00ed polohy na \u00farovni centimetr\u016f, ale ve skute\u010dn\u00fdch aplikac\u00edch je to pravd\u011bpodobn\u011b na \u00farovni decimetr\u016f; zat\u00edmco p\u0159esnost ur\u010dov\u00e1n\u00ed polohy Bluetooth AoA je pouze na \u00farovni metr\u016f a p\u0159esnost technologie ur\u010dov\u00e1n\u00ed polohy nov\u00e9 generace Bluetooth \u201eChannel Sounding\u201c je tak\u00e9 asi 1 m, tak\u017ee p\u0159esnost ur\u010dov\u00e1n\u00ed polohy UHF RFID nen\u00ed \u0161patn\u00e1.<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>","protected":false},"excerpt":{"rendered":"<p>Lze UHF RFID pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed? Dovolte mi, abych v\u00e1m nejprve odpov\u011bd\u011bl. UHF RFID lze pou\u017e\u00edt pro vysoce p\u0159esn\u00e9 polohov\u00e1n\u00ed, ale p\u0159esnost je asi 1 metr. UHF RFID se pou\u017e\u00edv\u00e1 jako polohovac\u00ed \u0159e\u0161en\u00ed. Z\u00e1kladn\u00edm za\u0159\u00edzen\u00edm je \u010dte\u010dka vyu\u017e\u00edvaj\u00edc\u00ed sf\u00e1zovanou ant\u00e9nu. Princip sf\u00e1zovan\u00e9 ant\u00e9ny [\u2026]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2904","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts\/2904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/comments?post=2904"}],"version-history":[{"count":2,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts\/2904\/revisions"}],"predecessor-version":[{"id":2910,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/posts\/2904\/revisions\/2910"}],"wp:attachment":[{"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/media?parent=2904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/categories?post=2904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nfc-readers.com\/cs\/wp-json\/wp\/v2\/tags?post=2904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}